2271163781 has 2 divisors, whose sum is σ = 2271163782. Its totient is φ = 2271163780.

The previous prime is 2271163753. The next prime is 2271163787. The reversal of 2271163781 is 1873611722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1268428225 + 1002735556 = 35615^2 + 31666^2 .

It is a cyclic number.

It is not a de Polignac number, because 2271163781 - 2³⁰ = 1197421957 is a prime.

It is a super-2 number, since 2×2271163781² = 10316369840252431922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2271163787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1135581890 + 1135581891.

It is an arithmetic number, because the mean of its divisors is an integer number (1135581891).

Almost surely, 2^2271163781 is an apocalyptic number.

It is an amenable number.

2271163781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2271163781 is an equidigital number, since it uses as much as digits as its factorization.

2271163781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 38.

The square root of 2271163781 is about 47656.7286015312. The cubic root of 2271163781 is about 1314.4663857771.

The spelling of 2271163781 in words is "two billion, two hundred seventy-one million, one hundred sixty-three thousand, seven hundred eighty-one".